configmap传参

已ENV方式挂载configmap，传入参数至容器变量中。

1.查看当前的configmap：
[root@master yaml]# kubectl get configmap
NAME              DATA   AGE
nginx-configmap   2      56m
nginx-www         1      41m


[root@master yaml]# kubectl describe  configmap   nginx-configmap
Name:         nginx-configmap
Namespace:    default
Labels:       <none>
Annotations:  kubectl.kubernetes.io/last-applied-configuration:
                {"apiVersion":"v1","data":{"name_server":"nginx","nginx_port":"99"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"nginx-configma...

Data
====
name_server:                   ##变量名1
----
nginx                          ##变量名对应的变量值1
nginx_port:                    ##变量名2
----
99                             ##变量名对应的值2
Events:  <none>




2.编写nginx-deployment-configmap.yaml
[root@master yaml]# cat nginx-deploy-configmap.yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: nginx-deployment-configmap
 labels:
   app: nginx
spec:
 replicas: 2
 selector:
  matchLabels:
   app: nginx
 template:
  metadata:
   name: nginx
   labels:
    app: nginx
  spec:
    containers:
    - name: nginx-configmap
      image: nginx:latest
      imagePullPolicy: IfNotPresent
      env:                              ##以变量env的方式传入参数到容器
      - name: NGINX_SERVER_NAME         ##定义容器里面的变量为  NGINX_SERVER_NAME
        valueFrom:
         configMapKeyRef:
          name: nginx-configmap        ##指定configmap
          key: name_server             ##configmap中的（变量名1 name_server)的值为被传入容器定义的变量名为  NGINX_SERVER_NAME
          optional: true               ## true 表示如果configmap 里面没有这个name_server变量，容器也能够正常启动。
      - name: NGINX_PORT               ## 定义容器里的变量名为  NGINX_PORT
        valueFrom:
          configMapKeyRef:
           name: nginx-configmap        ##指定configmap
           key: nginx_port              ## configmap中（变量名2  nginx-configmap）的值被传入容器定义的变量名为  NGINX_PORT
           optional: true



说明：

---
apiVersion: v1
kind: Service
metadata:
 name: nginx-svc
 labels:
  app: nginx
spec:
 selector:
  app: nginx
 ports:
 - name: http
   targetPort: 80
   port: 80


[root@master yaml]# kubectl apply -f  nginx-deploy-configmap.yaml



3.进入nginx-deploy-configmap:

[root@master yaml]# kubectl get pod
NAME                                          READY   STATUS    RESTARTS   AGE
httpd-856c97d764-6zq2d                        1/1     Running   9          8d
jenkins-6d7fb8f845-b7rx5                      1/1     Running   9          8d
jenkins-6d7fb8f845-fwrp2                      1/1     Running   3          3d1h
myapp-599d47757d-x5955                        1/1     Running   9          8d
nginx-deployment-configmap-6f99f7dbdf-h5q9j   1/1     Running   0          11m
nginx-deployment-configmap-6f99f7dbdf-mmtcz   1/1     Running   0          11m
tomcat-deploy-7f994d9dc9-plzjz                1/1     Running   13         9d

[root@master yaml]# kubectl exec -it nginx-deployment-configmap-6f99f7dbdf-h5q9j /bin/sh

# env |grep ^NGINX
..........
NGINX_SERVER_NAME=nginx                
NGINX_PORT=99
NGINX_SVC_SERVICE_PORT_HTTP=80

说明：表示configmap中，nginx-configmap定义的变量名1，变量名2,的值已经被传入容器中定义的变量了。

[root@master yaml]# kubectl get configmap
NAME DATA AGE
nginx-configmap 2 79m
nginx-www 1 64m

[root@master yaml]# kubectl describe configmap nginx-configmap
Name: nginx-configmap
Namespace: default
Labels: <none>
Annotations: kubectl.kubernetes.io/last-applied-configuration:
{"apiVersion":"v1","data":{"name_server":"nginx","nginx_port":"99"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"nginx-configma...

Data
====
name_server:
----
nginx
nginx_port:
----
99
Events: <none>

---

---